[pianotech] Size of Pinblock Drill bit?

[paul bruesch]

A proper "reamer" has straight vertical cutting (not scraping) flutes. What
is commonly referred to here as "reaming" is correctly known as "chasing",
where one runs a drill *bit* (a *drill* is a tool that turns a bit)
slightly larger than the initial hole to "chase it" out.

Paul Bruesch
Stillwater, MN


On Thu, Mar 7, 2013 at 2:16 PM, Jim Ialeggio <jim at grandpianosolutions.com>wrote:

> Ed Foot wrote:
>
> <I have made my own pinblock reamers from bits in which I grind away all
> the cutting edges for the first inch or so of the bit. It makes for an
> accurate pilot without chewing a
> sideways hole on the way in.
>
> This is interesting and makes a lot of sense.
>
> So, what exactly is the cutting action of a reamer?  Is is simply a
> scraping action?  If so, what keeps the 1st hole's wall fibres from just
> bending over rather than actually being sheared off ?
>
> Jim Ialeggio
>
> --
> Jim Ialeggio
> jim at grandpianosolutions.com
> 978 425-9026
> Shirley Center, MA
>
>
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